NAMD and multi-rail IB for improved latency

From: Dow Hurst (
Date: Thu Mar 26 2009 - 21:55:13 CDT

We've got a couple of weeks max to finalize spec'ing a new cluster. Has
anyone knowledge of lowering latency for NAMD by implementing a
multi-rail IB solution using MVAPICH or Intel's MPI? My research tells
me latency is key to scaling effectively. Has anyone cut down latency
to below 1.0us using multi-rail IB?

If so, what was the configuration of cards and software? Any caveats

Anyone run NAMD on top of Appro's enhanced version of Intel's MPI in a
multi-rail configuration?

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